Charlos.
First he gets disrespected and attacked by Zoro.
Then he just wanted to buy a mermaid. Which is totally legal. Instead, his excellency was abused by some brute pirates. And the dumb admiral who was supposed to protect him couldn't even capture those pirates.
Later, he wanted to seize another mermaid. Which is also totally legal. And this time he was beaten half dead by a fellow celestial dragon.
Now some terrorist assault his homeland and cut off supply chains.
Hurt people hurt people